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Summarize an article on climate change.

Additional Context:
Climate change is a growing global phenomenon and a major environmental challenge facing humanity. Climate change is already occurring and is expected to worsen over the coming decades. Its impacts on humans, ecosystems, and the planet are vast and varied, from more extreme hot and cold temperatures to more extreme weather events such as floods and droughts, to rising sea levels.

Answer:
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Climate change is a global issue that is already causing harm and is expected to worsen over time. It is causing more extreme temperatures, more extreme weather events such as floods and droughts, and rising sea levels. This phenomenon presents a major challenge for humanity, as its impacts on humans, ecosystems, and the planet are far-reaching.